Research on reconstruction of the global sound speed profile combining partial underwater prior information

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY Journal of Sea Research Pub Date : 2024-06-21 DOI:10.1016/j.seares.2024.102516
Yuyao Liu , Yu Chen , Yichi Zhang , Wei Chen , Zhou Meng
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Abstract

The sound speed profile (SSP) is an important factor affecting the acoustic propagation characteristics of the ocean, making the accurate acquisition of SSP a crucial step in the interdisciplinary research of oceanography and underwater acoustics. Limited by the cost of in-situ measurement and the performance of the instrument itself, direct measurement of SSP inevitably leads to insufficient depth or even missing information. In this paper, we propose using partial underwater prior information (UWPI) only including underwater sound speed to obtain preliminary reconstruction results of global SSP for the first time. The empirical orthogonal function (EOF) reconstruction algorithm is optimized by employing assimilated SSP as the background SSP to further reduce reconstruction errors. The maximum global average reconstruction error and root mean square error (RMSE) after optimization decrease by >51% and 71%, respectively, which indicates that the performance of the optimized algorithm combined with partial UWPI is further improved. Finally, the performance of the optimized algorithm is discussed from the perspective of acoustic propagation. This research provides a reliable technical approach for SSP reconstruction under incomplete depth conditions, which can be applied in underwater sound field prediction and acoustic detection in the future.

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结合部分水下先验信息重建全球声速剖面的研究
声速剖面(SSP)是影响海洋声波传播特性的重要因素,因此准确获取 SSP 是海洋学和水下声学跨学科研究的关键步骤。受现场测量成本和仪器本身性能的限制,直接测量 SSP 不可避免地会导致深度不足甚至信息缺失。本文提出利用仅包括水下声速的部分水下先验信息(UWPI),首次获得全球 SSP 的初步重建结果。采用同化 SSP 作为背景 SSP,优化了经验正交函数(EOF)重建算法,进一步降低了重建误差。优化后的最大全局平均重建误差和均方根误差(RMSE)分别降低了 51% 和 71%,这表明优化算法结合部分 UWPI 的性能得到了进一步提高。最后,从声波传播的角度讨论了优化算法的性能。该研究为不完全深度条件下的 SSP 重建提供了一种可靠的技术方法,未来可应用于水下声场预测和声学探测。
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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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